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    <a href="1.html">作业1</a>
    <a href="2.html">作业2</a>
    <a href="3.html">作业3</a>
    <a href="4.html">作业4</a>
    <a href="5.html">作业5</a>
    <a href="6.html">作业6</a>
    <a href="demo.html">作业7</a>
    <a href="demo2.html">作业8</a>
    <a href="demo(3).html">作业9</a>
    <a href="设置滚动垂直滚动的距离.html">作业10</a>
    <a href="设置滚动垂直滚动的距离（2）.html">作业11</a>
    <a href="设置滚动垂直滚动的距离（3）.html">作业12</a>
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